Callisto
Saturn’s Moon Rhea
The Cronian system (i.e. Saturn and its system of rings and moons) is breathtaking to behold and intriguing to study.…
Io, Jupiter’s Volcanic Moon
Io is one of the four large Galilean moons of Jupiter, visible with binoculars or a small telescope. Let's learn…
Jupiter’s Moon Callisto
With 67 confirmed satellites, Jupiter has the largest system of moons in the Solar System. The greatest of these are…
Jupiter’s Moon Ganymede
In 1610, Galileo Galilei looked up at the night sky through a telescope of his own design. Spotting Jupiter, he…
Jupiter’s Moon Europa
Jupiter's four largest moons - aka. the Galilean Moons, consisting of Io, Europa, Ganymede, and Callisto - are nothing if…
What are the Galilean Moons?
It's no accident that Jupiter shares its name with the king of the gods. In addition to being the largest…
Pluto’s Closeup Will Be Awesome Based On Jupiter Pics From New Horizons Spacecraft
New Horizons, you gotta wake up this weekend. There's so much work ahead of you when you reach Pluto next…
Jupiter-Bound Spacecraft Takes A Small Step To Seek Habitable Worlds
It takes years of painstaking work to get a spacecraft off the ground. So when you have a spacecraft like…
Observing Alert: Rare Triple Transit Of Jupiter’s Moons Happens Friday Night (Oct. 11-12)
Talk about a great fall lineup. Three of Jupiter's four brightest moons plan a rare show for telescopic observers on…
One of Jupiter’s Moons is Melted!
[/caption] Jupiter's two moons Ganymede and Callisto could be considered fraternal twins. They have a similar composition and size, but…